Bacillus thuringiensis is a soil bacteria which can produce spores while generate a lot of insecticidal crystal proteins in forms of parasporal crystal in the stationary phase. The mechanism of highly efficient protein expression and insecticidal had attracted a lot of researchers'interesting. However, the molecular mechanism of formation of crystal proteins is not clear. In order to figure out the effect of Bacillus thuringiensis spore-specific transcription factor-Sig35 on the expression of spores...